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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94e9e1b9c3b8eef8c1d058c477ae7c5db8ab7ba8e2ebb7749da928b4d90a16c9' 
  AND token = '1dXomw4+Nh8Z5V+APa05/lL6XNy2z3Q6MU35aXeomUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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