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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b102447a2ae0eaf2afeab9b857a093f25ee0288293bb13d5908e658d93d4cae8' 
  AND token = 'uunVp2IyooytTke0R2VddHstXef3GX/HgugYMFzpEsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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