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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b472a3a83bfcc24cc2146ab9dcf04128c357c7ff397e77a0ffb988fe1fd3668b' 
  AND token = 'HSVV7+CIvGkpaNn+anonqld1cQho/SkjNmKhhUU7ox0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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