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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e70f73617414073905e29b76fe8d6586b553bf81be758ef23d132cd522491aa' 
  AND token = '+Ub7se60hn2khlLB8FeyZBiLy0ud7HKSa7CU+IBdhYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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