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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc32b0a6aac0141f8d459f7d4ac09d09966e54dec48d869b1c830a39fe5feb48' 
  AND token = 'bARSn2cM3Kclo6ad6mdoZs00VkWWgpvxwY5As9B8yhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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