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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b89f098280bb8415d02c43867ad18cd52f74d8ab747335629ed343040ee05a9d' 
  AND token = 'fWpSVTENxz9Uz/lGLipn3doBUdS6NyjaefkvRRN8D4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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