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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60a3425e98ba92037a1ca9d7efca17ac713735a8a84ef3e1331442674928b095' 
  AND token = 'wbAFE2DK99+IFJYy5kxma000F4o4yKa0pBWWmjkVRrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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