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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba551af83d67e8b91e17d015d03c9b35fd1e798c7011d01f09506d8bc6912e9d' 
  AND token = '0ArL5qznkPGHKkauspLFoIU5BvEBq97erNI7HvEKVVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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