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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4e26ed7dee12005700842ef8f29cab6935efb0c52c0fdeb2ed43dfa57954044' 
  AND token = 'kSq3lZpr7h9xPw4PfLANarBS4Zbj8NbW9qhY5b2sp6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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