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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd44353736a01388ed4b82ffbf098dee3a7d4114706e5254439829a4068b24e66' 
  AND token = 'zI+0w+E136LJ/Bc023eqQKGdI2cdV/a/JyeLgKLA0po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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