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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8f189a4f6ca83af15e82ccc4553f64dbfe02c92ebf942df04f47072416dd323' 
  AND token = 'ieMKnp8v9vLhReg1RypeCd9dOy3AARFT8chAHE06mPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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