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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3dd036fa0779a2766b6cc63039efb06edfb07a086ec8479776fbe4f1141bc27' 
  AND token = 'Vmkm1TA7bUP3gWlkakZYD1eY7emaNfxZW1SFI9gQUgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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