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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8b98aab5b1c70273f04bebb8b3ed3656d3a23f13f457661fbd679ac17b9fcfd' 
  AND token = 'FMSbdS2MNK5EdrR5D7vQ2XXztPSbPlaaaF9dsGXNAKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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