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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5b32dd7494f60ad438bda1298e2bbfeb083b5030318b3186bef19941059b5f6' 
  AND token = 'ZsbSieTnWApGC8Qm4dQnvxgaB93oW4rr+yj8h9E++bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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