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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43eca8b2efeb0e5d7dfdcce01dba9352b162d81fd561c9bc1c9685e28096adec' 
  AND token = 'o2d1h8gMkn/p4rUJTlN7OJIHffve7wlTC/VMWyvXHVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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