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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2ea89e7233a0dc4de8b361f34f7fe490c21971eb71788a4419fe7ed9d9caf4c' 
  AND token = 'wRLU8qg7tJ93U5Z39fOrjkmt7TpKc2gkSPVH7DMfawo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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