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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4966fde1add6be6b33886a6e17fbe0e23965384b4783f47a450d63ee96c5477' 
  AND token = 'on/VPMw5j/TU5BEVsdwyX78tpFEtMLI4SdB/L4X4irI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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