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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba958836ad25bb5b2abdb06b05989faeb411f41c00063dd1d671e10e96e7236d' 
  AND token = 'nudGp3sJhEL2MQYxZA3HENqWy120U+pAIM+87sDdFME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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