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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cbfd5eb2dcc8c8364072553123340f89f4f250670f402954cbafc78c396dda0' 
  AND token = 'dk+37q+mp+HtAGOZNBclOfLzek18US6UsOEF2vyMieg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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