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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26de900140bea648dba39d4d7d230ff514c80c91d75c253b61f3f07111541219' 
  AND token = '7fmh3sNmGPpx+Dz38eolEwgPv3+fv58hErhOTb2gCbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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