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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '784e1fc9dbebb728c17c6b5cf47dd690d73a2a4ad2c01f89be665627665dca73' 
  AND token = 't6ZOl6ECK9v6/FKBixH2xbs5Yi0G/t9GqqPStQNQpHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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