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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fb956bcfc45bff14fae38589e2542cc840c9172291190f33cb1e4abe90961ff' 
  AND token = 'COnmB/msGA7xROTnNaCKyD/21dEO3QgmPZmx1FjiQtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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