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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89eb059eb9c7cf9ce632e879d0d777ba9e8cbdecb0ac77c7e0f4710749ef5923' 
  AND token = 'jnaPk6ETqX3jlEHGfov1ZR2Q7d6MDeiAcNClZluxLvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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