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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66b70f9fc53341b6c5eba92c3dffca379504c7a6bda8ddb95807cbf12835064b' 
  AND token = 'ijEhBEy14y8brGJk73GQkmNZVTthV5L0q3aHIMQzLk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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