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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdee7b2fdd4fa76b9854d7151eb24deee609a3778ca73a3a82aaa8996e9c8d5d' 
  AND token = '+ouJfNXB/zQZu7yIVM08ZnsMmpRqeo19YqH2uTHKaxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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