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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c972aa7322ac6e7a65c1b60904de1031afb5dbe1eb70d73251647f546600e79' 
  AND token = 'pueMAHLn29Ke7KrwKN4rPJq2AmpYM6QJ6t6y3V0vAFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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