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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd1572247c4f9fa8f666415aa77a36a250d722f0e8e961e8a20b69d5113a3662' 
  AND token = 'Sut96J0pN8P4YQ/rw61dK0lnzXCSa8JabO4hm3jyz5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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