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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb0e30c74c58062328eed4476ef91d5031bce7434b4d95661dbbb3892a5849c2' 
  AND token = 'br4/7TFM6e3+qkzSqkz2vIuHeroOjKKhN2ENhTFSAx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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