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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a2bdca9b8b02c04bab35c26cb98b57daa957ec0ba9c174c5ce52a1262f16253' 
  AND token = '34Jg8UegM2pCoH6ZYwSrH0tpDXIpBcw4vnS8ztRM4fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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