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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93185f0812f30ff32f654b3ef7bad764f237c80aef7fababa22169a42733da4d' 
  AND token = '92rtXHTFqElu89xA83PXFw/EAogCxcDfPHnDNFD/cMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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