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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75be4be31fbf09f4f58ea6c285fdaf790677fbe0b2c27c8e6a5e9babe9e63a11' 
  AND token = 'O9lcOSypO9BV/pZx0qqf7Aq2Kj+mU32NeTxqI/AplyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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