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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f23cdd69534b8465fb666b43d740c0791cee6e9c88a959be5aa83e047d26d501' 
  AND token = '4YE31h8B5mB+IoqDIdg/hQYU4GedV9xbvT9QWa1yA6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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