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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee043add77129f517ff43ed7c8b6ef36ca223e89775983126d67fe0e57071b8f' 
  AND token = 'Sx0BMH67YY3bI+SjsQowpBJMfLkqwTHIds6Rdjqio78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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