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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5653af6c5d89378ab747accc01df87aa5a86fe1ef1b2ecb893dcbc25e008a44b' 
  AND token = 'RlIbMWWxjS4Qi6Nakmc8ctKa0I+TFoYhvnSd0fZ9H0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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