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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '504979ff34656d3c3a7e094ecc8dc280225239cd72da118f7a4a93076ec2ce3b' 
  AND token = 'ZXhx9d9Ml1gLmy8vkeg+PvvwTnSRnD31+9iDkTLleBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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