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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97102ad4b0fb61ae63047d7078b23d40291d5198afaece55212ea96e3abb51b4' 
  AND token = 'b/b40fwa3OPGKEinNoWfjX+tT46ips9NBLHCPxG9N6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}