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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cca8d88f7df98bc3a88f362f46e41d2a1cfb72c450da076940574306b2f840dc' 
  AND token = 'pca/pas204y4DeP8y0Q6I88M1W0s/oS6BTE6oxkD10U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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