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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de8d56597acfca5882ed9919173f57777bac7eaf65f8f7f62696b6903e6286c3' 
  AND token = 'LL5bVXlApla8DlUu1eNDVjCC/fO5vBtB1gBxwUDgwx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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