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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6660b5144598f6914d047e09f2c9d15acc9c1b2c0cea6f5751c41a482077eee2' 
  AND token = 'fmtJIVXbbTk4igdrd1pwcMyM0nlngqb5/t/YZ+zTzYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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