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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90a5a9cb71c6cb6cd8853dc410bb15dcb0ce77850adc47ab9bbc06de9ddf1f26' 
  AND token = 'xy0SE0QPGTCQ9gB01608uRO/pkKjo5CshpE9JjBXVCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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