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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10698e0e697115b89a2468e5640314c015192cf8f79307d76ef4ed851b924914' 
  AND token = 'x7gcPuEk8zQcD38NR5AA7+/d2GWSvxG3wa0ywhu7u78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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