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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7d6b0f9c8a8e2dda1500ae0ba2a13153c3466d301a519cbfbb44f3bd66e8704' 
  AND token = '+qNaROayLbfF245yhOgx3XFZ0s9S464V98Pew+/Z2iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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