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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64c20d5cc30793aaa162bed079b782c94f0fd553be43265a9732e43cfff67fd2' 
  AND token = 'Ec7q3Jbfkop2clyzzwjdD6HflNWTe5XncLj+OowrRbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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